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-rw-r--r--src/convert.cpp87
1 files changed, 69 insertions, 18 deletions
diff --git a/src/convert.cpp b/src/convert.cpp
index 303ead2..c30acb9 100644
--- a/src/convert.cpp
+++ b/src/convert.cpp
@@ -5,6 +5,8 @@
#include <winapi/utf8.hpp>
+#include <SafeInt.hpp>
+
#include <windows.h>
#include <cstddef>
@@ -22,6 +24,62 @@ std::runtime_error error(const char* function, DWORD code) {
return std::runtime_error{oss.str()};
}
+int convert_input_bytes_to_bytes(std::size_t nb) {
+ int real_nb = 0;
+
+ if (!SafeCast(nb, real_nb)) {
+ std::ostringstream oss;
+ oss << "input buffer is too large at " << nb << " bytes";
+ throw std::runtime_error{oss.str()};
+ }
+
+ return real_nb;
+}
+
+int convert_input_bytes_to_chars(std::size_t nb) {
+ if (nb % sizeof(WCHAR) != 0) {
+ std::ostringstream oss;
+ oss << "invalid buffer size: " << nb;
+ throw std::runtime_error{oss.str()};
+ }
+
+ const std::size_t nch = nb / sizeof(WCHAR);
+
+ int real_nch = 0;
+
+ if (!SafeCast(nch, real_nch)) {
+ std::ostringstream oss;
+ oss << "input buffer is too large at " << nch << " characters";
+ throw std::runtime_error{oss.str()};
+ }
+
+ return real_nch;
+}
+
+template <typename CharT>
+std::vector<CharT> output_buffer(int size) {
+ std::size_t real_size = 0;
+
+ if (!SafeCast(size, real_size)) {
+ std::ostringstream oss;
+ oss << "invalid buffer size " << size;
+ throw std::runtime_error{oss.str()};
+ }
+
+ std::vector<CharT> buffer;
+ buffer.resize(real_size);
+ return buffer;
+}
+
+template <typename CharT>
+void verify_output(const std::vector<CharT>& expected, int actual_size) {
+ if (!SafeEquals(expected.size(), actual_size)) {
+ std::ostringstream oss;
+ oss << "expected output length " << expected.size() << ", got " << actual_size;
+ throw std::runtime_error{oss.str()};
+ }
+}
+
} // namespace
std::wstring widen(const std::string& src) {
@@ -35,24 +93,25 @@ std::wstring widen(const std::vector<unsigned char>& src) {
std::wstring widen(const void* src, std::size_t in_nb) {
const DWORD flags = MB_ERR_INVALID_CHARS;
- const char* in_data = reinterpret_cast<const char*>(src);
+ const auto in_data = reinterpret_cast<const char*>(src);
+ const auto real_in_nb = convert_input_bytes_to_bytes(in_nb);
- auto out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, in_nb, NULL, 0);
+ auto out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, real_in_nb, NULL, 0);
if (out_nch == 0) {
throw error("MultiByteToWideChar", GetLastError());
}
static_assert(sizeof(wchar_t) == sizeof(WCHAR), "wchar_t != WCHAR");
- std::vector<wchar_t> out;
- out.resize(out_nch);
+ auto out = output_buffer<wchar_t>(out_nch);
- out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, in_nb, out.data(), out.size());
+ out_nch = ::MultiByteToWideChar(CP_UTF8, flags, in_data, real_in_nb, out.data(), out_nch);
if (out_nch == 0) {
throw error("MultiByteToWideChar", GetLastError());
}
+ verify_output(out, out_nch);
return {out.data(), out.size()};
}
@@ -66,17 +125,10 @@ std::string narrow(const std::vector<unsigned char>& src) {
}
std::string narrow(const void* src, std::size_t in_nb) {
- if (in_nb % sizeof(WCHAR) != 0) {
- std::ostringstream err_msg;
- err_msg << "narrow: invalid buffer size: " << in_nb;
- throw std::runtime_error{err_msg.str()};
- }
-
- const std::size_t in_nch = in_nb / sizeof(WCHAR);
-
const DWORD flags = WC_ERR_INVALID_CHARS;
- const wchar_t* in_data = reinterpret_cast<const wchar_t*>(src);
+ const auto in_data = reinterpret_cast<const wchar_t*>(src);
+ const auto in_nch = convert_input_bytes_to_chars(in_nb);
auto out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, NULL, 0, NULL, NULL);
@@ -84,16 +136,15 @@ std::string narrow(const void* src, std::size_t in_nb) {
throw error("WideCharToMultiByte", GetLastError());
}
- std::vector<char> out;
- out.resize(out_nb);
+ auto out = output_buffer<char>(out_nb);
- out_nb =
- ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, out.data(), out.size(), NULL, NULL);
+ out_nb = ::WideCharToMultiByte(CP_UTF8, flags, in_data, in_nch, out.data(), out_nb, NULL, NULL);
if (out_nb == 0) {
throw error("WideCharToMultiByte", GetLastError());
}
+ verify_output(out, out_nb);
return {out.data(), out.size()};
}